<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        {{message}} 
        <button >i think to</button>
    </div>
</body>
<script src="./Vue.js"></script>
<script>
  let vm =  new Vue({
        el:"#app",
        data:{
            message:"hello world,to day is a nice day", //插值表达式一 字面量

        }
    })

</script>
</html>